The book covers basic theories, basic knowledge and basic skills on clinical diagnosis, basic requirements for doctors' ethical conduct, clinical reasoning and documentation of medical records during the process of making a diagnosis. It consists of seven chapters. Part 1 'Symptoms' explains the causes, mechanism, clinical manifestations and history taking of symptoms of every system, underling the process in which students familiarize themselves with clinical manifestations and learn history taking. Part 2 'History Taking' focuses on the significance, content, methods and techniques of history taking and introduces special approaches for history taking under unusual conditions. Part 3 'Physical Examination' illustrates the importance and basic procedures of physical examination, content and methods used to examine organs and systems, and signs and their clinical significance. This chapter also discusses basic requirements and content for both general physical examination and specific physical examination. Part 4 'Supplementary Examination' introduces commonly used clinical supplementary examination procedures including electronic cardiography (ECG), blood gases and acid-base balance and endoscopy. Part 5 'Common Clinical Diagnosis Techniques' details indications, contraindications and operation essentials of common diagnosis and operation skills such as thoracentesis, abdominal paracentesis, lumbar puncture and bone marrow puncture. Part 6 'Diagnostic Process and Clinical Reasoning' emphasizes professionalism in the process of diagnosis and explains diagnostic procedures and basic principles and approaches of clinical reasoning. A vocabulary index is included for easy reference at the end of the book. This book is compiled by authors of 14 Chinese medical schools and universities, whose years of experience in clinical diagnostics, rich overseas learning and working experiences. This book is included in the first round of English textbooks series for clinical medicine major of China's higher medical colleges; and is among "13th Five-Year" planning textbooks of National Health Commission of the People's Republic of China. It is a co-publication book with People's Medical Publishing House (PMPH).